linux/drivers/irqchip/irq-hip04.c
Marc Zyngier a2df12c589 irqchip/hip04: Configure IPIs as standard interrupts
In order to switch the hip04 driver to provide standard interrupts
for IPIs, rework the way interrupts are allocated, making sure
the irqdomain covers the SGIs as well as the rest of the interrupt
range.

The driver is otherwise so old-school that it creates all interrupts
upfront (duh!), so there is hardly anything else to change, apart
from communicating the IPIs to the arch code.

Signed-off-by: Marc Zyngier <maz@kernel.org>
2020-09-17 16:37:27 +01:00

411 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Hisilicon HiP04 INTC
*
* Copyright (C) 2002-2014 ARM Limited.
* Copyright (c) 2013-2014 Hisilicon Ltd.
* Copyright (c) 2013-2014 Linaro Ltd.
*
* Interrupt architecture for the HIP04 INTC:
*
* o There is one Interrupt Distributor, which receives interrupts
* from system devices and sends them to the Interrupt Controllers.
*
* o There is one CPU Interface per CPU, which sends interrupts sent
* by the Distributor, and interrupts generated locally, to the
* associated CPU. The base address of the CPU interface is usually
* aliased so that the same address points to different chips depending
* on the CPU it is accessed from.
*
* Note that IRQs 0-31 are special - they are local to each CPU.
* As such, the enable set/clear, pending set/clear and active bit
* registers are banked per-cpu for these sources.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/cpu_pm.h>
#include <linux/cpumask.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/irqchip.h>
#include <linux/irqchip/arm-gic.h>
#include <asm/irq.h>
#include <asm/exception.h>
#include <asm/smp_plat.h>
#include "irq-gic-common.h"
#define HIP04_MAX_IRQS 510
struct hip04_irq_data {
void __iomem *dist_base;
void __iomem *cpu_base;
struct irq_domain *domain;
unsigned int nr_irqs;
};
static DEFINE_RAW_SPINLOCK(irq_controller_lock);
/*
* The GIC mapping of CPU interfaces does not necessarily match
* the logical CPU numbering. Let's use a mapping as returned
* by the GIC itself.
*/
#define NR_HIP04_CPU_IF 16
static u16 hip04_cpu_map[NR_HIP04_CPU_IF] __read_mostly;
static struct hip04_irq_data hip04_data __read_mostly;
static inline void __iomem *hip04_dist_base(struct irq_data *d)
{
struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
return hip04_data->dist_base;
}
static inline void __iomem *hip04_cpu_base(struct irq_data *d)
{
struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
return hip04_data->cpu_base;
}
static inline unsigned int hip04_irq(struct irq_data *d)
{
return d->hwirq;
}
/*
* Routines to acknowledge, disable and enable interrupts
*/
static void hip04_mask_irq(struct irq_data *d)
{
u32 mask = 1 << (hip04_irq(d) % 32);
raw_spin_lock(&irq_controller_lock);
writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_CLEAR +
(hip04_irq(d) / 32) * 4);
raw_spin_unlock(&irq_controller_lock);
}
static void hip04_unmask_irq(struct irq_data *d)
{
u32 mask = 1 << (hip04_irq(d) % 32);
raw_spin_lock(&irq_controller_lock);
writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_SET +
(hip04_irq(d) / 32) * 4);
raw_spin_unlock(&irq_controller_lock);
}
static void hip04_eoi_irq(struct irq_data *d)
{
writel_relaxed(hip04_irq(d), hip04_cpu_base(d) + GIC_CPU_EOI);
}
static int hip04_irq_set_type(struct irq_data *d, unsigned int type)
{
void __iomem *base = hip04_dist_base(d);
unsigned int irq = hip04_irq(d);
int ret;
/* Interrupt configuration for SGIs can't be changed */
if (irq < 16)
return -EINVAL;
/* SPIs have restrictions on the supported types */
if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
type != IRQ_TYPE_EDGE_RISING)
return -EINVAL;
raw_spin_lock(&irq_controller_lock);
ret = gic_configure_irq(irq, type, base + GIC_DIST_CONFIG, NULL);
if (ret && irq < 32) {
/* Misconfigured PPIs are usually not fatal */
pr_warn("GIC: PPI%d is secure or misconfigured\n", irq - 16);
ret = 0;
}
raw_spin_unlock(&irq_controller_lock);
return ret;
}
#ifdef CONFIG_SMP
static int hip04_irq_set_affinity(struct irq_data *d,
const struct cpumask *mask_val,
bool force)
{
void __iomem *reg;
unsigned int cpu, shift = (hip04_irq(d) % 2) * 16;
u32 val, mask, bit;
if (!force)
cpu = cpumask_any_and(mask_val, cpu_online_mask);
else
cpu = cpumask_first(mask_val);
if (cpu >= NR_HIP04_CPU_IF || cpu >= nr_cpu_ids)
return -EINVAL;
raw_spin_lock(&irq_controller_lock);
reg = hip04_dist_base(d) + GIC_DIST_TARGET + ((hip04_irq(d) * 2) & ~3);
mask = 0xffff << shift;
bit = hip04_cpu_map[cpu] << shift;
val = readl_relaxed(reg) & ~mask;
writel_relaxed(val | bit, reg);
raw_spin_unlock(&irq_controller_lock);
irq_data_update_effective_affinity(d, cpumask_of(cpu));
return IRQ_SET_MASK_OK;
}
static void hip04_ipi_send_mask(struct irq_data *d, const struct cpumask *mask)
{
int cpu;
unsigned long flags, map = 0;
raw_spin_lock_irqsave(&irq_controller_lock, flags);
/* Convert our logical CPU mask into a physical one. */
for_each_cpu(cpu, mask)
map |= hip04_cpu_map[cpu];
/*
* Ensure that stores to Normal memory are visible to the
* other CPUs before they observe us issuing the IPI.
*/
dmb(ishst);
/* this always happens on GIC0 */
writel_relaxed(map << 8 | d->hwirq, hip04_data.dist_base + GIC_DIST_SOFTINT);
raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
}
#endif
static void __exception_irq_entry hip04_handle_irq(struct pt_regs *regs)
{
u32 irqstat, irqnr;
void __iomem *cpu_base = hip04_data.cpu_base;
do {
irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
irqnr = irqstat & GICC_IAR_INT_ID_MASK;
if (irqnr <= HIP04_MAX_IRQS)
handle_domain_irq(hip04_data.domain, irqnr, regs);
} while (irqnr > HIP04_MAX_IRQS);
}
static struct irq_chip hip04_irq_chip = {
.name = "HIP04 INTC",
.irq_mask = hip04_mask_irq,
.irq_unmask = hip04_unmask_irq,
.irq_eoi = hip04_eoi_irq,
.irq_set_type = hip04_irq_set_type,
#ifdef CONFIG_SMP
.irq_set_affinity = hip04_irq_set_affinity,
.ipi_send_mask = hip04_ipi_send_mask,
#endif
.flags = IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_SKIP_SET_WAKE |
IRQCHIP_MASK_ON_SUSPEND,
};
static u16 hip04_get_cpumask(struct hip04_irq_data *intc)
{
void __iomem *base = intc->dist_base;
u32 mask, i;
for (i = mask = 0; i < 32; i += 2) {
mask = readl_relaxed(base + GIC_DIST_TARGET + i * 2);
mask |= mask >> 16;
if (mask)
break;
}
if (!mask)
pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
return mask;
}
static void __init hip04_irq_dist_init(struct hip04_irq_data *intc)
{
unsigned int i;
u32 cpumask;
unsigned int nr_irqs = intc->nr_irqs;
void __iomem *base = intc->dist_base;
writel_relaxed(0, base + GIC_DIST_CTRL);
/*
* Set all global interrupts to this CPU only.
*/
cpumask = hip04_get_cpumask(intc);
cpumask |= cpumask << 16;
for (i = 32; i < nr_irqs; i += 2)
writel_relaxed(cpumask, base + GIC_DIST_TARGET + ((i * 2) & ~3));
gic_dist_config(base, nr_irqs, NULL);
writel_relaxed(1, base + GIC_DIST_CTRL);
}
static void hip04_irq_cpu_init(struct hip04_irq_data *intc)
{
void __iomem *dist_base = intc->dist_base;
void __iomem *base = intc->cpu_base;
unsigned int cpu_mask, cpu = smp_processor_id();
int i;
/*
* Get what the GIC says our CPU mask is.
*/
BUG_ON(cpu >= NR_HIP04_CPU_IF);
cpu_mask = hip04_get_cpumask(intc);
hip04_cpu_map[cpu] = cpu_mask;
/*
* Clear our mask from the other map entries in case they're
* still undefined.
*/
for (i = 0; i < NR_HIP04_CPU_IF; i++)
if (i != cpu)
hip04_cpu_map[i] &= ~cpu_mask;
gic_cpu_config(dist_base, 32, NULL);
writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
writel_relaxed(1, base + GIC_CPU_CTRL);
}
static int hip04_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
if (hw < 16) {
irq_set_percpu_devid(irq);
irq_set_chip_and_handler(irq, &hip04_irq_chip,
handle_percpu_devid_fasteoi_ipi);
} else if (hw < 32) {
irq_set_percpu_devid(irq);
irq_set_chip_and_handler(irq, &hip04_irq_chip,
handle_percpu_devid_irq);
} else {
irq_set_chip_and_handler(irq, &hip04_irq_chip,
handle_fasteoi_irq);
irq_set_probe(irq);
irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
}
irq_set_chip_data(irq, d->host_data);
return 0;
}
static int hip04_irq_domain_xlate(struct irq_domain *d,
struct device_node *controller,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq,
unsigned int *out_type)
{
if (irq_domain_get_of_node(d) != controller)
return -EINVAL;
if (intsize == 1 && intspec[0] < 16) {
*out_hwirq = intspec[0];
*out_type = IRQ_TYPE_EDGE_RISING;
return 0;
}
if (intsize < 3)
return -EINVAL;
/* Get the interrupt number and add 16 to skip over SGIs */
*out_hwirq = intspec[1] + 16;
/* For SPIs, we need to add 16 more to get the irq ID number */
if (!intspec[0])
*out_hwirq += 16;
*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
return 0;
}
static int hip04_irq_starting_cpu(unsigned int cpu)
{
hip04_irq_cpu_init(&hip04_data);
return 0;
}
static const struct irq_domain_ops hip04_irq_domain_ops = {
.map = hip04_irq_domain_map,
.xlate = hip04_irq_domain_xlate,
};
static int __init
hip04_of_init(struct device_node *node, struct device_node *parent)
{
int nr_irqs, irq_base, i;
if (WARN_ON(!node))
return -ENODEV;
hip04_data.dist_base = of_iomap(node, 0);
WARN(!hip04_data.dist_base, "fail to map hip04 intc dist registers\n");
hip04_data.cpu_base = of_iomap(node, 1);
WARN(!hip04_data.cpu_base, "unable to map hip04 intc cpu registers\n");
/*
* Initialize the CPU interface map to all CPUs.
* It will be refined as each CPU probes its ID.
*/
for (i = 0; i < NR_HIP04_CPU_IF; i++)
hip04_cpu_map[i] = 0xffff;
/*
* Find out how many interrupts are supported.
* The HIP04 INTC only supports up to 510 interrupt sources.
*/
nr_irqs = readl_relaxed(hip04_data.dist_base + GIC_DIST_CTR) & 0x1f;
nr_irqs = (nr_irqs + 1) * 32;
if (nr_irqs > HIP04_MAX_IRQS)
nr_irqs = HIP04_MAX_IRQS;
hip04_data.nr_irqs = nr_irqs;
irq_base = irq_alloc_descs(-1, 0, nr_irqs, numa_node_id());
if (irq_base < 0) {
pr_err("failed to allocate IRQ numbers\n");
return -EINVAL;
}
hip04_data.domain = irq_domain_add_legacy(node, nr_irqs, irq_base,
0,
&hip04_irq_domain_ops,
&hip04_data);
if (WARN_ON(!hip04_data.domain))
return -EINVAL;
#ifdef CONFIG_SMP
set_smp_ipi_range(irq_base, 16);
#endif
set_handle_irq(hip04_handle_irq);
hip04_irq_dist_init(&hip04_data);
cpuhp_setup_state(CPUHP_AP_IRQ_HIP04_STARTING, "irqchip/hip04:starting",
hip04_irq_starting_cpu, NULL);
return 0;
}
IRQCHIP_DECLARE(hip04_intc, "hisilicon,hip04-intc", hip04_of_init);